MEXICO CITY—Nine out of ten Mexicans voting on Sunday in an unprecedented recall election engineered by President Andres Manuel Lopez Obrador backed him to stay in office, underlining his domination of a polarized political agenda. Both critics and supporters alike had viewed his victory as a foregone conclusion in a ballot that had fed speculation it could open the door to extending presidential term limits, now limited to a single six-year period. Between 90.3 percent and 91.9 percent voters were predicted to have supported Lopez Obrador, a preliminary estimate from the National Electoral Institute (INE) showed on Sunday night. Unleashing a string of barbs at adversaries, Lopez Obrador hailed the referendum result as “historic”, and compared his tally favorably with the number of votes won by rivals he defeated to win the presidency, and in other elections. “We don’t have a king in Mexico,” he said in a video address. …